'Thrombin' definitions:

Definition of 'thrombin'

(from WordNet)
noun
An enzyme that acts on fibrinogen in blood causing it to clot

Definition of 'Thrombin'

From: GCIDE
  • Thrombin \Throm"bin\, n. [See Thrombus.] (Biochem.) The enzyme which converts fibrinogen into fibrin. [Webster 1913 Suppl. +PJC] [1913 Webster]